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¡ L Í J Á S I . . :
E X P L A I N E D BY THE MICROSCOPE,
time the parts are as diflinél, and their quantities and proportions areas regularly kept,
and as well obferved, as if the lines had run with the moft perfeft ñraitnefs. For the
reft, what is obfervable in this fine Tree, is, that the Pith is extremely fraall j the
Corona very delicate, but finely formed, and it runs into deeper, angles than is ufualiy
feen: the Sap-Veflels of the Wood are largeft in the youngeft parts of it j and tlie
Yaia. propria exteriora are very diftinft.
C H A P. V.
P A R T I C U L A R I T I E S IN THE C O R O N A OF TREES.
LI I T S P L A : I
I N THE C L S TUS HI
E S S
R I F 0 L I
TH E R E can be no doubt but the conftruft ion of this eiTential parti s perieftly the PLATE
fame in all Trees : the ftrifteft obfervations, and the powers of the greateftglafles, XXIX.
join to ihew this: but here, as in the Wood, and elfewhere, altho' the parts are invariably
the fame, their difpofition differs wonderfully. In the Ciftus Laurifolia
Plate XXIX. the Corona is little more than a plain ring, a i in which, however, we a
fee eafily the fimple ftruiture of the Bark in the outer part, l>, unmixed with other I,
matter. In the portion next the Pith, that darker line it firit exhibits, c, ihews, when c
viewed with due advantage, the clufters, on which all future encreafe depends. d
For the reft, the coarfe form of the Blea, e, is fingular in this Shrub j as is alfo the c
thicknefs of that line which terminates the Wood toward the Blea, f . The Sap-Vef- f
fels, in the Wood itfelf are fmall, but finely difpofed; and in the Pith, h, there g h
are fome clufters of the Vafa intima, i, whofe contents are lefs compaft tlian thofe i
veffels ufualiy have them.
I I . O F THE E X T E R I O R PROMINENCE OF THE CLUSTERS
I N T H E M A G N O L I A GLAUCA.
The Corona in this beautiful Tree does not carry the fimple outline of the Ciftus : PLATE
its clufters are not buried in its fubftance. The whole of the Corona of this Tree, a fedion
of which is given in Plate XXX. is of an undulated form, a ; and its wavy promi- a
nences, b, which are but fmall toward the Pith, fwell out into the form of obtufe and },
O unequal